Your gestures and how you hold yourself during a presentation convey as much as words might. Inc.…
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Gestures should relate to the message and not be a mannerism of the speaker. The most powerful gestures are image gestures: using your hands to create a visual image of the concept you're trying to communicate. For example: If you're talking about exceeding expectations, let one hand represent where your business is at now, and move the other one gradually past it, with your body getting into the act as well for added power.

Grant adds that you should keep your hands within the frame of your body, so you avoid distracting your audience. Check out the full article linked below for some other useful tips on being a good public speaker.